<<<<<<< HEAD:first homework/f22011219-郭欣/Quackbehavior.java
package com.example.Lib;
=======
package com.example.f22011226;
>>>>>>> 9847e549d509add37aeccd03e626d0f7a5d9ad62:first homework/f22011226_卢鸣宇/Quackbehavior.java

public interface Quackbehavior {
    void quack();
}
